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I assumed the Garmin thing was backup nav. I normally have 3 electronic nav devices with me and never paper but I guess it depends how remote you go. Walking is probably more conducive to using paper maps than cycling.
Yeah, I've carried a space blanket on a few things now. Never needed it thankfully but it could help if you drown all your warm kit by falling in a stream or something.
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Fair. I'm just suspicious of electronics when actually remote, I use them but assume they'll fail at some crucial moment. It's not actually happened to me, but I live in fear of the one time it does being caught without a paper option.
Walking is basically an excuse to get paper maps out for a lot of people.
I hope i'm not overstepping, but, I would take a paper copy of your map, I think you can print out off that set up. Id do that so you have a back up if you drop your phone, or it dies because its cold etc. I always carry a compass in my first aid kit too.
Also at that altitude if something bad does happen I would carry a space blanket when going lightweight, or an emergency shelter on full pack days.
I've never camped in a car, let us know how it goes.
I loved New Mexico when I visited as a teenager, we had a massive RV for the family and it was brilliant.